Automatic dumping car



March 15, 1927. 1,621,075

w. H. LARKIN AUTOMATIC DUMPING CAR Filed Jan. 13 1923 2 Sheets-Sheet 1 INVENTUR William H. [tar/( i 77 his attorney March 15, 1927. 1,621,075

W. H. LARKIN AUTOMATIC DUMPING CAR Filed Jan. 13, 1923 2 Sheets-Sheet 2 his attorney Patented Mar. 15, i927.

" oai'reo smarts WILLIAM H. Lenx ia, or PITTSBURGH, rENNs LvAmA.

, AU'roM 'ric DUIYIEING can application filed January 1?, 1923. "Serial No 812,4139.

This invention relates to an automatic .dumpin car.

Do ie diet o the invent n i t p de a dumping car compr pivotedbody the weight of which is so proportioned that the body tends to swing to dumping position 'when carrying a load and to return to set or carrying position when the load has been dumped. I l p Nether j t o the tw ties is t provide such dumping car with means which autom tica ly o k the body s t 9 arryne'r ien, t h ch my med ate y h r r f the ar to P rmit sw es es of h bo y to um in e e A f the object a the n e en i 110 P vide means under the control of the driver of t ar where y mo emen fi hser if) either d mp 9 arr n Pasties m b checked .or'retarded.

' r A sti furthe o e t f he nven ion is to pr vide h body wi h a ta gate, and 01 crating means therefor, so arranged that the gate is automatically locked open in dumped position of th hody andlookejd shut set wir ng pos pi the}??? l n the accompanying dra lugs Figure 1 1s s d el yati e ofth d me .g car; Figur 2 is a v r a long tudinal se on t reof an Fise e 3 i a de ail levati n o the ta gat oj he ump ng ar the leaking an the ier- Y Th body "1 o e-1s, aslshe n learly is is 'es l nd 2, r ve lly e e nt d'qn a transverse rod 2, sup-ported jby webs or ra kets es end ns inward y from th cha si of diesel?- t w ll be -obs.e re fi st w nsidera io of Fi ur at the drawin ha he p vo edift f thebei edy'isie th rear of the transverse median line thereof;

he tlie we t f thebedy its lf, w unloaded, causes the forward end thereof to swing downwardly into set or carrying 'position. l-twvill also-he obse-ryed that a portion of the space at the forward end of the body is walled off by an angularly disposed partition 5. This partition 5 is so disposed that when the body is loaded with a broken or granular substance, such as crushed rock, coal, sand, gravel, or the like, the distribution of the load more than counter-balances the superior weight of the forward portion of the body itself.

The means for retaining the body 1 of the car in set or carrying position when loaded comprises a pivoted lever 6, which is on a '3 of I l asedtransverse rod? mounted in brackets 8. At v is normally held in position to engage hook Q with-body'l by means of a stronghelical spring 11 hearing against-the under side of t e leve per ing l ver 10 e 'e Pedal 12 whic h is di'sposedadjaoent the drivers set-11113, andby means of whielitheoperating lever 10 and lever 6 may be moved to diseng ge bo k .9 rom t forwa emi y f'bO V 1- l H I I:

' Tll etail gate 14 of the body 1 is swing-l mounted by'mearis or a transverserod '15 the rear of the body' In theset or carrying position of t'he' body (shown in Figure 1 of'the drawings) this tail gate 14 is securedin closed position 'by means of 'a' lever 16, which is pivotally mounted on the under side of the body adjaoeiitthe rear ward extremity thereof andwhich has thereon a hook '17 arranged to engage the lower extremity of the gate. "A :coiled' s ring 18 yieldingly maintains the hook 17 in'engageinept with the gate 14. dW'lieh, however,

body swings todumping position, the

spri i cr 1.8: is colilpressed as shown Figure The m an for lo k ng he g t 14 h in set 01* carryingposition oftheibody 1 co1nagainst one extremity pof he lever U he drawings), and the tail gate is reprises alooking disk '19 at one extremity of f the rod 15 5 this locking disk .being provided w th no c for r ceiving-t QO 'h ca ried by an L-shapedlever 21 pivoted at 22 15. t esideofthebodyi As the tailgate 14 s'wings open, tooth 2Q engages inlthe' notch in lgickiriQ'disk 19 to hold'the :gate in its open position; The tooth 20is pressed into this ageme t y {means of a l ca Pr s or the'iike 2,3, which'bears againstthe lower extremity oflever 21 Also connected with the lower extremity of lever 21 is a rod 24, which is supported on the side of the body 1 and extends longitudinally thereaiong.

Adjacent'the forward extremity of bodyl l,

the rod 24 is connected by means of a bell 25, forces the rod 24 and the lower eX- "notch in locking disk 19.

tremity of lever 21 rearwardly against the resistance of spring 23. The tooth 20 is thus withdrawn from the notch in looking disk 19; and. the tail gate 14 swings by gravity into closed position, in which it is engaged by the hook 17 on lever 16. While the lower extremity of rod 26 remains in contact with the base a of the car, the tooth 20 is maintained out of engagement with the It will be understood the means for locking the body in set or carrying position, and for locking the tail gate in open and closed position may be duplicated on the opposite sides of the car.

Means are also provided to exert a braking action on the body during its swinging movements and to place such movements under the control of the driver of the car. Such means comprises an oil cylinder 27, which is supported by the base or frame 4L of the car and having its plunger 28 connected by link 29 with the under side of the body 1. In communication with the inter-ior of cylinder 27 on opposite sides of the piston 30 thereof'are conduits 31 and 32,

interconnected by way of a valve 33 which is disposed within reach of the driver of the car.

If, therefore, it is desired to dump the car when loaded, the driver depresses pedal 12 to disengage hook 9 from body 1'; and operates'valve 33 to permit circulation of oil through conduits 31 and 32. The weight of the load then brings the body into the dumping position shown in Figure 2 of the drawings; and the return of the body to. set position during lightening of the load, and before complete discharge thereof, may be prevented by operating valve 33 to cut off thecirculation of oil to and from cylinder 27, the'cylinder thus acting as a locking means for the body during dumping of the load.

When the load has been completely discharged from the'body 1, valve 33 is operated to again permit circulation of fluid to and from cylinder 27, and the body 1 returns of its own vweight to set or carrying ,position in which it is engaged by the hook 9. i

It will be'understood that in set or carrying position of the body, as well as in dumpthat, if so desired, 7

ing position thereof, the oil cylinder 27 serves as a positive look. It thus serves to prevent undesired movement of the body when loaded to dumping position due to accidental depression of the pedal 12. It also places the rate of movement of the body 1 wholly under the control of the operator, so that as desired such movement may be either'smooth and gradual or rapid and abrupt.

During direction, the elements for controlling the end gate actautomatioally, as described above, to maintain the gate in open or closed position.

The dumping car described above presents an automatic but controlled movement of the body to and from dumping position, and provides a double lock against accidental movement in either direction. The means for retaining the load in the body of the car are also wholly automatic and are operation of the body in either coordinated with the movement of the body side of the pivotal point thereof, said body being so arranged that the weight of'a' normal load therein overbalances the distribution of weight of the body as a whole and the distribution of weight of the body as a whole tends to return the body to carrying position when unloaded a fluid containing cylinder having a piston, and conduits leading to said cylinder on both sides of said piston and interconnected by way of a suitable control valve, whereby the cylinder permits swinging movement of the body in accordance with the freedom of fluid circu- 'lation by way of said conduits.

In witness whereof, I hereunto set, my hand.

WILLIAM H. LARKIN. 

